# Heptane (n-Heptane) — US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side

For Heptane (n-Heptane), cas no. is 142-82-5; pel (ppm) is 500; pel (mg/m³) is 2000, verified against its source on 2026-08-05.

- **Substance:** Heptane (n-Heptane)
- **CAS No.:** 142-82-5
- **PEL (ppm):** 500
- **PEL (mg/m³):** 2000

## What the source says

> Heptane (n-Heptane) | 142-82-5 | 500 | 2000 | - |

## Source

- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1

Last verified: 2026-08-05. Review by: 2027-08-05.
Part of [US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side](https://referencesource.org/workplace-exposure-limits/).